[Articular manifestations in patients with atypical rheumatic fever]

To describe the clinical characteristics and the occurrence of atypical arthritis in children diagnosed with rheumatic fever (RF) and followed in tertiary care clinics in Salvador, Bahia, Brazil.

A descriptive study of a case series, of the initial clinical presentation, and of recurrence in 41 children diagnosed with RF.

Of the patients studied (n=41), 61% were male, mean age of 9.2 years, and mean age at diagnosis between 5 and 16 years. Arthritis was present in 75.6% of patients; carditis in 75.6%; chorea in 31.7%; erythema marginatum in 14.6%; and subcutaneous nodules in 4.9%. An atypical pattern was observed in 22 of 31 cases of arthritis (70.9%): involvement of small joints and/or axial skeleton in 12 cases (38.7%); >3 weeks of duration in 9 (29%); inadequate response to NSAIDs in 2 (6.5%); oligoarthritis (≤4 joints) in 22/31 (71%), with monoarthritis in 6/31 (1 in the foot, 1 in the ankle, and 4 in the knee). Fever was present in 78% of the cases, and 82.9% of patients were regularly on secondary prophylaxis.

Atypical arthritis was present in most patients presenting with joint involvement, being a confounding factor against a proper diagnosis and of therapeutic delay.